That is really good equipment you have and I think it’s similar to what I have. I too was using Itunes and have quite a library of AIFF files on a Western Digital Hard Drive that uses WD MyCloud. Because I have a limited budget, I opted to try the Bluesound Node 2 and BluOS software. I can access all my AIFF files and stream via a wide variety of streaming services like Spotify and Tidal. There is much written about Bluesound...have a look. But for me it fits perfectly and sounds great. If you ever try Roon again, Bluesound can marry up with Roon as well. For those who want to try a better DAC with Bluesound, many out there can be used and some can also play MQA tracks.
Apple iTunes or What Else
My Apple iTunes has 2500 CDs or records on a separate hard drive on a Mac computer. All the music is in AIFF files, and the sound is excellent. The music is streamed wirelessly using Apple Airport Express. My amp is a current Rotel Integrated with DAC and capabilities for optical or coaxial. I use both depending on my mood. The speakers are Monitor Audio Gold 100 which I love. My question is: " What other software would one recommend if I wanted to move away from Apple iTunes. Not dissatisfied but explore a change. Software must operate on Mac OS system.